Preparation For Servicing - Sylvania Emerson 6719DC Service Manual

How to Enter the Service Mode
Caution: 1
1. Optical sensors system are used for Tape Start
and End Sensor on this equipment. Read this page
carefully and prepare as described on this page
before starting to service; otherwise, the unit may
operate unexpectedly.
Preparing: 1
1. Cover Q202 (START SENSOR) and Q201 (END
SENSOR) with Insulation Tape or enter the service
mode to activate Sensor Inhibition automatically.
Note: Avoid playing, rewinding or fast forwarding the
tape to its beginning or end, because both Tape End
Sensors are not active.
How to Enter the Service Mode
1. Turn power on.
2. Use service remote control unit and press WAKE-
UP/SLEEP key. (See page 1-8-1)
3. When entering the service mode, one of the num-
ber (1, 2 or 4) will display at corners of the screen.
4. During the service mode, electrical adjustment
mode can be selected by remote control key. (Ser-
vice remote control unit).
Details are as follows.
Key
Picture adjustment mode: Press the
MENU button to change from BRT
(Bright), *CNT (Contrast), *CLR
MENU (Color), *TNT(Tint) and *V-T. Press
CH UP/DOWN key to display Initial
Value. *Marked items are not neces-
sary to adjust normally.
C-Trap and Y DL Time adjustment
0 mode: See adjustment instructions
page 1-8-3.
1 No need to use.
AGC/H adjustment mode: See adjust-
2
ment instructions page 1-8-2.
Auto AFT adjustment mode: See
3
adjustment instructions page 1-8-2.
Auto record mode: Perform recording
4 (15 Sec.)-->Stop-->Rewind (Zero
return) automatically.
Head switching point adjustment
5 mode: See adjustment instructions
page 1-8-5.

PREPARATION FOR SERVICING

Adjustment Mode
Key
6
Purity check mode: Shows Red,
Green, Blue or White cyclically on the
7
screen each time the "7" key is
pressed.
H. Shift adjustment mode: See adjust-
8
ment instructions page 1-8-4.
V.size/V. shift adjustment: See adjust-
9
ment instructions page 1-8-3.
Caution: 2
1. The deck mechanism assembly is mounted on the
Main CBA directly, and SW1211 (REC-SAFETY
SW) is mounted on the Main CBA. When deck
mechanism assembly is removed from the Main
CBA due to servicing, this switch can not be oper-
ated automatically.
Preparing: 2
1. To eject the tape, press the STOP/EJECT button
on the unit (or Remote Control).
2. When you want to record during the Service mode,
press the Rec button while depressing SW1211
(REC-SAFETY SW) on the Main CBA.
Q201
(END SENSOR)
SW1211
(REC-SAFETY SW)
1-5-1
Adjustment Mode
No need to use.
Q202
(START SENSOR)
MAIN CBA
TD500PFS